Described herein are methods for distributing a combination of a cell division inhibitor (e.g., temsirolimus or paclitaxel) and dexamethasone to a tissue surrounding a blood vessel for treating vascular diseases. Also disclosed are injectable compositions of a cell division inhibitor (e.g., temsirolimus or paclitaxel) and dexamethasone for delivery into the tissue surrounding a blood vessel for treating vascular diseases.